Do not add each item data as props but wrap it in a single data prop.

Author: dclause

dist/index.js

@@ -530,7 +530,9 @@
       return h(this.tag, {
         role: 'item'
       }, [h(this.component, {
-        props: this.source
+        props: {
+          data: this.source
+        }
       })]);
     }
   }); // wrapping for slot.

src/item.js

@@ -58,7 +58,7 @@ export const Item = Vue.component('virtual-list-item', {
     return h(this.tag, {
       role: 'item'
     }, [h(this.component, {
-      props: this.source
+      props: { data: this.source }
     })])
   }
 })